Question: Which IGAC rating category has the lowest age?
Paraphrase: Which category of IGAC rating is the lowest age?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q52690603 . ?ent wdt:P2899 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: M/18, M/16, M/14, M/12, M/6